It's hard to tell without a picture of the left side of the stock, but if there is an extra inlet opposite of the bolt inlet then it would be to make room for the safety -- the wing safety is farther back almost to the start of the grip.The cut out on the left side is for the bolt release. Looks like theb stock has been repaired?
I dug up pictures of my old 1413 and the bolt release is slightly inlet into the stock, whereas on my current 1913 the bolt release is positioned higher and has no inlet. There is an inlet for the safety however, which is just behind the bolt release.JasonJ what were you reading???? I said it was for the BOLT RELEASE!
I also think it is for a 64 action. There are very few 54 action's out there with a mag, although there some.



























